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How to determine Input impedance...

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pumanba2

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I'm trying to determine input impedance of nrc - cross-coupled pair... and really can't handle it :(

I've got the picture of the circuit and its small signal equivalent circuit:

problem.png

Additionaly, I've got final results for imaginary and real part of input conductance:

results.png

The point is that I can't find any way to get these results from above...

Pls, help
 

Anybody? plss.. I got stuck here... and don't know how to manage with it....

Even the smallest tips would be welcomed
 

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